I just bought and installed the mediaserver upgrade form version 4.5 to version 5. But after the upgrade,my original and resized camera JPG pictures (resized to 800x600 resolution) are shown (Denon S-302) in a very low pixel quality on my Denon S302. With the old media server 4 (latest rev), the quality is good. It looks like the new server is serving up the albumart (thumbnail) versions of the images instead of the full versions of the photos !

Upgrade to version 5.1-RC6-4 makes no difference, still low quality

Is there a fix for this or do i have to uninstall this new release of the server..?

open the folder "cgi-bin" below Twonky's installation directory and delete the files "convert.exe" and "cgi-jpegscale.exe" and then press rebuild database. This should disable server side picture scaling.